War adventure with an eerie supernatural undercurrent. In World War 2, an American submarine rescues three survivors from a British hospital ship sunk by the Nazis. What should have been a routine rescue mission escalates into claustrophobic terror as the crew begin collectively to experience paranoid delusions - and to believe that their vessel is haunted. When first officer Lieutenant Brice (Bruce Greenwood) is forced to take over command after the unexpected death of the submarine's commander, he finds he must not only shake off the German destroyer attacking the sub, he must also get to the bottom of the string of mysterious and terrifying incidents that are debilitating his crew.